21778911

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{2857}}^1$

素因数の和:2892

約数の個数: 36

約数和(自身を含む): 39531856

約数和(自身を除く): 17752945

約数列:

[1, 3, 7, 9, 11, 21, 33, 63, 77, 99, 121, 231, 363, 693, 847, 1089, 2541, 2857, 7623, 8571, 19999, 25713, 31427, 59997, 94281, 179991, 219989, 282843, 345697, 659967, 1037091, 1979901, 2419879, 3111273, 7259637, 21778911]

約数ペア:

[(1, 21778911), (3, 7259637), (7, 3111273), (9, 2419879), (11, 1979901), (21, 1037091), (33, 659967), (63, 345697), (77, 282843), (99, 219989), (121, 179991), (231, 94281), (363, 59997), (693, 31427), (847, 25713), (1089, 19999), (2541, 8571), (2857, 7623)]